Significant Customers (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues attributable to sales [Line Items]
Document Period End Date			Jun. 30, 2014
Total	48.70%	68.50%	47.90%	67.60%
Significant Customers (Textual) [Abstract]
Numbers of customers	6	6	6	6
Avnet [Member]
Revenues attributable to sales [Line Items]
Total	16.50%	12.40%	16.70%	12.50%
Enel [Member]
Revenues attributable to sales [Line Items]
Total	2.80%	16.90%	6.00%	12.20%
Ubitronix [Member]
Revenues attributable to sales [Line Items]
Total	7.20%	10.70%	7.80%	11.70%
Duke [Member]
Revenues attributable to sales [Line Items]
Total	1.80%	6.30%	4.60%	7.80%
Telvent [Member]
Revenues attributable to sales [Line Items]
Total	10.50%	17.90%	7.20%	20.00%
Goerlitz [Member]
Revenues attributable to sales [Line Items]
Total	9.90%	4.30%	5.60%	3.40%